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We Know That Carbon Dioxide Levels Were in the Atmosphere

Question 3

Multiple Choice

We know that carbon dioxide levels were in the atmosphere millions of years ago through ____.


A) radioisotope dating
B) measuring carbon dioxide levels in fossil fuel samples
C) measuring carbon isotope ratios in fossil fuel samples
D) measuring carbon dioxide levels in air pockets in ice cores
E) measuring carbon isotope ratios in air pockets in ice cores

Correct Answer:

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